Billur, E.Cetin, B.Music, O.Simsir, C.Davut, K.Department of Metallurgical and Materials EngineeringAutomotive EngineeringManufacturing Engineering2024-07-052024-07-05201731877-705810.1016/j.proeng.2017.10.9672-s2.0-85036656356https://doi.org/10.1016/j.proeng.2017.10.967https://hdl.handle.net/20.500.14411/597Simsir, Caner/0009-0006-7871-4232; Billur, Eren/0000-0001-9984-3697; Davut, Kemal/0000-0002-9860-881X; Music, Omer/0000-0003-0738-5903Various methods have been designed to determine the elasto-plastic properties of metals. Instrumented indentation test (IIT) is considered to be a good candidate to determine local properties after manufacturing operations. In order to acquire elastoplastic properties from IIT, either dimensional analysis or inverse analysis of the force-displacement curve is performed. However, the major drawback of those methods is the uniqueness of the solution. Some materials may exhibit almost identical force-depth curves, although they have different elastoplastic properties. Those materials are referred as "mystical materials". In this contribution, topological features of the indentation surfaces, i.e. indent size, pile-up and sink-in behaviour, are investigated to find a differentiating property. According to the results, indent size, pile-up and sink-in behaviour may help to find the unique solution to the inverse problem. (C) 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the scientific committee of the International Conference on the Technology of Plasticity.eninfo:eu-repo/semantics/openAccessInstrumented indentation testelasto-plastic propertiesmystical materialConference Object207962967WOS:000569773100162